What Causes Household Mold? The 5 Primary Causes

Mold isn’t bad by definition. Spores are in the air everywhere, and grow into mold outdoors as an essential part of the environment. That mold breaks down matter like dead leaves and branches. Indoor mold is another story. You don’t want it colonizing on surfaces in your home and endangering your health. What causes household mold? These are the five primary causes.


If you’re the victim of flooding, it doesn’t matter how fast you move. You’ll likely be dealing with some moldy aftermath. Those spores can land and start proliferating in wetness after 24 hours—and it could be weeks before everything dries out.

Inadequate Ventilation

Always use the fan during showers and over your stove. Bathrooms and kitchens see a lot of evaporating water and steam, and it needs to escape somewhere. If your fans and ductwork aren’t functioning to move the moisture out of your home, mildew might move in.

Leaking Pipes

Don’t blame yourself if you didn’t notice a leak. It often happens somewhere you can’t see it, like in the ceiling or between your walls. Water heaters can develop leaks, too. By the time you discover the mold, it may have firmly taken root.

Leaking Roofs

If you regularly check your attic, you can keep an eye out for signs of a leaking roof. If it needs any repairs, it will trickle into your attic, creating the perfect conditions for mold: warmth, humidity, darkness, oxygen, and a nice surface on which to feast. You can check your ceilings for clues, too.

Constant Humidity

Does this one sound familiar? At Mold Only, we cover the South Florida region, and it’s hard to get away from the high humidity. We’re one of the rare local mold removal companies devoted to doing one thing extraordinarily well. We know that consistently high levels of humidity can lead to mold and mildew on walls and ceilings and under sinks. High temperatures and dark areas will encourage the spores to spread.

These are the five primary causes that cause household mold, but there are more. If you’re smelling something musty or just have a bad feeling about that fuzzy spot, Mold Only can tell you the extent of your problem. We’ll find the source of it, and we have the training, experience, and equipment to remove and sanitize it. Call us today for an appointment.

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